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What is the impact on flow and pressure when the impeller of a pump is trimmed?
Wiki User
∙ 13y ago
Both pressure and flow decreases
Mulugeta Muche
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What is turbine diffuser and its pressure recovery?
Turbine diffusers are configured to improve pressure recovery within the turbo machinery. The diffuser both converts the non-uniform flow off the impeller into a uniform velocity profile and converts the dynamic energy of the flow into pressure with minimal losses. With an effective diffuser, the rotor exit static pressure will be less than the discharge value which increases the total/static pressure ratio of the turbine. With this increase in total/static pressure ratio, the total to total pressure ratio is reduced, but the overall turbine efficiency is improved.. Turbine diffusers are configured to improve pressure recovery within the turbo machinery. The diffuser both converts the non-uniform flow off the impeller into a uniform velocity profile and converts the dynamic energy of the flow into pressure with minimal losses. With an effective diffuser, the rotor exit static pressure will be less than the discharge value which increases the total/static pressure ratio of the turbine. With this increase in total/static pressure ratio, the total to total pressure ratio is reduced, but the overall turbine efficiency is improved.. For more information Read the Handbook of turbomachinery (Joseph Sherma, 2003 pg 342-348):
What pressure or force that causes current flow through a conductor is caleed?
The pressure or force causing current to flow through a conductor is called voltage.
How can you make water flow without pressure?
Of course
Why poiseuille equation not applied to turbulent flow?
Coz poiseuille eq is for poiseuille flow, which is a laminar flow, not turbulent flow. And it also need to be a fully developed , pressure driven flow.
What do you understand by technical current direction?
Current in metal conductors is normally termed either 'electron flow' or 'conventional flow'. I'm not aware of the term, 'technical current'.'Electron flow' assumes that current is a flow of free electrons through the conductor, from a negative potential to positive potential.'Conventional flow' (also known as 'Franklinian flow', after Benjamin Franklin) predates what we know about the atom, and was based on the assumption, by scientists such as Franklin, that current was a flow of some mysterious 'fluid' from a higher pressure ('positive' pressure) to a lower pressure ('negative' pressure).Some textbooks assume 'electron flow', whereas most assume (for no accountable reason!) 'conventional flow'. At least one textbook I know of has been published in two versions: an 'electron flow version' and a 'conventional flow version'!
What is the function of the impeller in a centrifugal pump?
Impeller make the flow has velocity in a centrifugal pump. The purpose of pump is increasing the pressure. The flow has velocity envergy via impeller and the energy change to pressure energy in diffuser.
What is the function of an impeller?
An impeller is used in many devices, such as a washing machine and water jet. An impeller is used to control the pressure and flow of water. It is found inside of a tube or a conduit, an impeller is a type of rotor.
What causes radial thrust in a centrifugal pump?
When a centrifugal pump operates at its best efficiency point (BEP), the flow angles match with the impeller vane angles. At the BEP, the flow velocity in the volute is uniform around the volute (i.e., there is not acceleration of the fluid in the volute). Therefore, the pressure around the volute is uniform. The uniform pressure around the circumference results in a net zero radial force on the impeller (or the shaft). Note this is theoretical. In practice even at BEP, there is a small radial load because the pressure is not uniform. If the pump is operated away from the BEP, the flow velocities in the volute are non-uniform which results in a non-uniform pressure field and a net radial load (can be obtained by integrating the pressure around the circumference of the volute or the impeller).
What is the form of flow in volute casing after the impeller in centrifugal pump?
rotational
What uses the flow of exhaust gasses out of the engine to pressurize the air entering the intake manifold?
a turbocharger uses exhaust gas to spin an impeller that boost atmospheric pressure and feeds it into engine
Put a 1 hp impeller on a 2 hp pool motor?
well the motor will like it, it will run cool but the power bill will be high. it will not have the flow of a 2hp impeller
Hayward DE fiter just acid washed return pressure still noticeably lower could it be impeller?
The cleaner the filter is the lower the initial back pressure is going to be, if you have a valve between the filter and the pool return turn, shut of the flow of water for just a moment. if the impeller is working properly the back pressure gauge should suddenly start to read high. Other reasons for low back pressure may be that the seals inside the unit are not properly settled.
How volute casing functions in pump?
volute has an increasing flow area as it wraps around the impeller.So, when the pump is operating at BEP (best efficiency point) ,have to keep the flow velocity constant around the impeller. To achieve that function, the area increases so as to accept the additional flow exiting the impeller.
What is pump surging?
Pump surging - if a pump doesn't have a minimum flow it will build up discharge pressure. When this discharge pressure gets high enough the pump cannot overcome it any more and the water starts to flow backwards. When the water starts to flow backwards, the pump slows down. The impeller will start to spin backwards building up pressure again. The water inside the pump will shift back and forth wreaking havoc with your pump impeller. This cycle of spinning forwards and backwards will repeat itself and will destroy your thrust bearing and destroy your pump. This can happen with any type of centrifugal pump, if you block the discharge the pump will build up pressure and surging can take place.
How does a sprinkler flow alarm system work?
There are many types, but primarily a flow alarm works by a pressure switch that indicates a pressure drop when a sprinkler head (or test valve) opens, or an actual in-flow mechanism (a propeller or a movable flap) that moves when water flows. Some early models (still in existence) run water through an impeller that moves a clapper in a gong while water is flowing.
How do impellers works?
Impellers are rotating devices that are used to increase the pressure and flow of fluids. They work by using their spinning motion to draw fluid into the center of the impeller and then propel it outwards along the blades or vanes. As the fluid is pushed outward, it gains velocity and its pressure increases, resulting in an increased flow rate.
What is the significance of specific speed?
Specific speed (Ns) is a non-dimensional design index used to classify pump impellers as to their type and proportions. It is defined as the speed in revolutions per minite at which a geometrically similar impeller would operate if it were of such a size as to deliver one gallon per minute against one foot of head. The formula used to determine specific speed is Where N = Speed of Pump in RPM Q = Capacity in gpm at the best efficiency point H = Head per stage in feet at the best efficiency point The specific speed determines the general shape or class of the impeller. As the specific speed increases, the ratio of the impeller outlet diameter, D2, to the inlet or eye diameter, Di, decreases. This ratio becomes 1.0 for a true axial flow impeller. Low specific speed - Radial flow Impeller. Medium specific speed - Mixed flow Impeller. High specific speed - Axial Flow Impeller.
